External electric field effects on fluorescence of perylene doped in a polymer film

Abstract

Abstract:Fluorerescence and electrofluorescence spectra of perylene molecules doped in a polymer film at different concentrations have been measured at different temperatures in the range of 70-295 K. At high concentrations where excimer is formed, LE fluorescence emitted from the locally excited state of perylene is quenched by an electric field at any temperature, indicating a field-induced enhancement of the excimer formation rate. Fluorescence of the Y-type excimer of perylene molecules shows a fieldinduced enhancement at room temperature, whereas it shows a field-induced quenching at low temperatures. The temperature dependence of the electric field effects on fluorescence has been discussed.--

Synthesis and aggregation properties of a series of dumbbell polyhedral oligosilsesquioxane-perylene diimide triads

“…The broad low energy emission of 1a can be assigned to the "excimer-like" states. [69][70][71] The maximum emission of 1b can be found at about 633 nm, which is significantly blue shifted compared with that of 1a in the solid state, but red-shifted compared with that of 1a in solution. This is a typical emission of a slipped "face-to-face" stacked PDI dimer with longitudinal displacement.…”

“…The maximum emission wavelength of 1c is about 680 nm, which is 50 nm longer than that of 1b. According to the literature, [69][70][71] this emission can be assigned to the "excimer-like" states.…”

Fluorescence quenching by charge carriers in indolo[3,2-b]carbazole-based polymer

“…The main of them are the fieldinduced exciton dissociation [1,2,[8][9][10][11] and fluorescence quenching by injected charge carriers [12][13][14][15][16]. The Stark effect may also cause the fluorescence intensity variations by changing the sample absorbance at excitation wavelength or by changing rates of electronic transitions [17,18]. These processes may influence the operation of optoelectronic devices, organic light-emitting diodes, solar cells and polymer lasers.…”

Identification of two emitting sites in the dissipative state of the major light harvesting antenna

“…The perturbation on the molecular energy levels induced by an external electric field is known as Stark effect and is extensively applied in molecular spectroscopy to examine the electronic structure and dynamics in the excited states [34][35][36][37][38][39][40][41] including the electronic structure of photosynthetic pigmentprotein complexes. [42][43][44][45] Stark spectroscopy which monitors field-induced changes in absorption (Stark Absorption, SA) or fluorescence (Stark Fluorescence, SF) can be used to estimate the change in electrostatic parameters such as change in permanent dipole moment and molecular polarizability upon optical excitation and/or relaxation.…”